A three-dimensional coordination polymer based on 1,2,3-triazole-4,5-dicarboxylic acid (H3tda): {[Cd12(tda)8(H2O)11] · (H2O)6.25}n

Abstract

The title coordination polymer {[Cd₁₂(tda)₈(H₂O)₁₁] · (H₂O)_6.25}_n (H₃tda = 1,2,3-triazole-4,5-dicarboxylic acid), has been hydrothermally synthesized and structurally characterized by single-crystal X-ray diffraction. Complex crystallizes in orthorhombic sp. gr. Pmn2₁ with Z = 4. The Cd₂ unit doublebridged by one carboxylate oxygen atom and two neighboring nitrogen atoms from the tda^3– ligands are linked by the tda^3–ligands to lead to the 2D (4,4) network in the ac plane. The almost coplanar Cd₂(μ₅-tda)₂ unit comprised of two Cd ions double-bridged by two tda^3– ligands through the neighboring nitrogen atoms is connected with the other four Cd₂(μ₅-tda)₂ units form the undulating 2D network in the ac plane. The (4,4) networks and undulating 2D networks are alternatively connected along the b axis by the tda^3– ligands coordinating to the Cd ions to form the 3D framework.